> - Super easy to get esims while traveling. e.g. in Mexico i downloaded an app while still in the airport and paid $5 with apple pay and instantly activated a 1 month esim.

This can be done with physical+esim, which my iPhone SE3 has.

Is there a distinct advantage to eSIM-only, with no physical slot, for travel?

> - You can have multiple esimss. With physical sims you are limited to the physical number of sim slots on your phone, usually 1 or at most 2. With esim there is no such restriction.

If you already have 1-eSIM capability, would it be hard to go to >1-eSIM+physical?

> Is there a distinct advantage to eSIM-only, with no physical slot, for travel?

IDK about only but it’s easier to get an eSIM setup ahead of time. It’s also easier to keep a bunch of esims handy vs physical sims. Guess it depends on your needs.